EUVD-2026-18088
GHSA-fc4p-p49v-r948
Severity by source
AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Lifecycle Timeline
4DescriptionGitHub Advisory
CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a production-ready, modular architecture with RBAC authorization and theme support. Prior to version 0.31.0.0, a Stored Cross-Site Scripting (Stored XSS) vulnerability exists in the backend user management functionality. The application fails to properly sanitize user-controlled input before rendering it in the administrative interface, allowing attackers to inject persistent JavaScript code. This results in automatic execution whenever backend users access the affected page, enabling session hijacking, privilege escalation, and full administrative account compromise. This issue has been patched in version 0.31.0.0.
AnalysisAI
Stored cross-site scripting in CI4MS backend user management allows authenticated attackers with low-level privileges to inject malicious JavaScript that executes automatically when administrators access affected pages, enabling session hijacking and full administrative account takeover. The vulnerability affects all versions prior to 0.31.0.0 with a critical CVSS score of 9.9 due to scope change and high impact across confidentiality, integrity, and availability. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Authenticated backend user account required to access CI4MS user management interface (versions before 0.31.0.0). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Real-world risk is critically high despite no confirmed active exploitation. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An authenticated attacker with low-level backend access creates or modifies a user account, injecting JavaScript payload into form fields such as username, display name, or bio that are rendered unsanitized in the administrative user listing page. When a system administrator navigates to the user management interface, the stored payload executes automatically in their browser session, exfiltrating session cookies to attacker-controlled infrastructure and enabling immediate administrative account takeover or execution of privileged operations such as creating backdoor accounts or modifying system configurations. |
| Remediation | Upgrade immediately to CI4MS version 0.31.0.0, which contains patches addressing the stored XSS vulnerability in backend user management functionality. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all CI4MS installations and their current versions; audit user access logs for suspicious activity in user management sections. …
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External POC / Exploit Code
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